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Lab 2

This lab experiment aims to measure the frequency of a microwave source using a cavity resonator. Key components include a microwave source, attenuator, cavity resonator, fixed diode detector, and resistive load. The frequency is calculated using the cavity resonator length and cutoff wavelength in an equation. By adjusting the cavity resonator length L until resonance is achieved, as detected by a deflection in the console unit, the linear and circular scale readings are used to calculate L and determine the frequency matches the known microwave source frequency of 10.4 GHz.

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Israr Ahmad
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44 views4 pages

Lab 2

This lab experiment aims to measure the frequency of a microwave source using a cavity resonator. Key components include a microwave source, attenuator, cavity resonator, fixed diode detector, and resistive load. The frequency is calculated using the cavity resonator length and cutoff wavelength in an equation. By adjusting the cavity resonator length L until resonance is achieved, as detected by a deflection in the console unit, the linear and circular scale readings are used to calculate L and determine the frequency matches the known microwave source frequency of 10.4 GHz.

Uploaded by

Israr Ahmad
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Lab #02

To measure frequency of microwave source using cavity


resonator
Components
 Console unit
 Microwave source
 Attenuator
 Cavity Resonator
 Fixed diode detector
 Resistive load
Theory
We can calculate frequency of the source using tis formula
 f=v/=c/0=c√1/g^2 + 1/c^2
where
g is guided wavelength

0 is Free space wavelength and

c is Cut off wavelength

For Mode E01 of cavity resonator c =37.1mm and g can be calculated


from analytical data that cavity resonator will resonates when
L=ng/2 ,where n=1,2,3……. Shows order of resonance,in this case n=1 because
only first order is present in X Band.

Thus for n=1, g=2L


Calculation
L(mm)=(linear scale reading)+(circular scale reading *0.01)
So
L(mm)=17+(20*0.01)
L(mm)=17.2
By putting in equation

 f=c√1/4L^2 + 1/c^2
we get f=10.6 GHz which is approximately equal to
microwave source frequency 10.4GHz

From graph it is f=10.57GHz


Circuit Diagram

Console unit

output input

Microwave
source Attenuator Cavity Fixed diode
meter Resistive
detector
load

Procedure
 Set the circuit accordimg to circuit diagram
 Check output for given input ,initially Pin=Pout ,so needle in the console unit
does not show any deflection
 Adjust L in such a way that the needle will show deflection when cavity
frequency will be equal to frequency of microwave source(at resonance
,circuit will absorb maximum energy,in this case Pin will not be equal to
Pout).
 At this position look for linear scale reading and circular scale reading.
 Finally calculate L and calculate frequency by putting it into above equation
or by looking in given graph with respect to this calculated length.

Measured data

Linear scale reading(mm)=17, Circular length(mm)=20


UNIVERSITY OF ENGINEERING & TECHNOLOGY,
PESHAWAR

MICROWAVE ENGINEERING
LAB REPORT
Israr Ahmad
16PWELE4958
SEC-C
7th Semester
Department:Electrical (comm)

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